Which tool is a layout tool?
a. offset box wrench c. pin punch
b. groove joint pliers d. none of these answers is correct
ANS: D
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Polychlorinated biphenyls (PCBs) are a group of synthetic oil-like chemicals that were at one time widely used as insulation in electrical equipment and were discharged into rivers. They were discovered to be a health hazard and were banned in the 1970s. Since then, much effort has gone into monitoring PCB concentrations in waterways. Assume that water samples are being drawn from a waterway in order to estimate the PCB concentration.
a. Suppose that a random sample of size 80 has a sample mean of 1.69 ppb and a sample standard deviation of 0.25 ppb. Find a 95% confidence interval for the PCB concentration. b. Estimate the sample size needed so that a 95% confidence interval will specify the population mean to within ±0.02 ppb.
If the centrifugal pump feeding cooled water to a series of water-cooled condensers breaks down, the head pressure of the vapor compression systems will decrease.
Answer the following statement true (T) or false (F)
Describe the model displayed in the accompanying figure and explain the subsystems that might be involved in the model.
What will be an ideal response?
Figure 10-3 In Figure 10-3, the loop number is ____________________.
Fill in the blank(s) with the appropriate word(s).